/**
 * Moondance UML modeling tool
 * 
 * This program is free software; you can redistribute it and
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package ro.pub.cs.se.moondance.command;

import org.eclipse.gef.commands.Command;

import ro.pub.cs.se.moondance.model.ClassVariable;
import ro.pub.cs.se.moondance.model.UMLBaseClass;

/**
 * Command to delete an attribute object
 */
public class AttributeDeleteCommand extends Command {

	private UMLBaseClass _class;
	private ClassVariable attribute;
	private int index = -1;

	public AttributeDeleteCommand(UMLBaseClass _class, ClassVariable attribute) {
		this._class = _class;
		this.attribute = attribute;
	}

	public boolean canExecute() {
		if (_class.getAttributes().size() > 1)
			return true;
		return true;
	}

	/**
	 * @see org.eclipse.gef.commands.Command#execute()
	 */
	public void execute() {
		primExecute();
	}

	/**
	 * Invokes the execution of this command.
	 */
	protected void primExecute() {
		index = _class.getAttributes().indexOf(attribute);
		_class.removeAttribute(attribute);
	}

	/**
	 * @see org.eclipse.gef.commands.Command#redo()
	 */
	public void redo() {
		primExecute();
	}

	/**
	 * @see org.eclipse.gef.commands.Command#undo()
	 */
	public void undo() {
		_class.addAttribute(attribute, index);
	}

}
